发明名称 |
CONTROL OF A SHAPE MEMORY ALLOY ACTUATION APPARATUS |
摘要 |
An SMA actuation arrangement comprises: an SMA actuator arranged on contraction caused by heating to drive movement of a movable element relative to a support structure; a current source operative to supply drive current through the SMA actuator to heat the SMA actuator; and a detector circuit operative to detect a measure of the resistance of the SMA actuator. Whilst detecting a measure of the resistance of the SMA actuator and controlling the drive current on the basis of the measure of the resistance of the SMA actuator; there is derived a measure of an electrical characteristic of the SMA actuator that is representative of the ambient temperature. Whilst applying closed-loop control an offset is added to the control signal which reduces the steady-state value of an error between the measure of the resistance of the SMA actuator and a target value. Whilst applying open-loop control, the control signal is generated taking into account the electrical characteristics of the SMA actuator measured during a calibration stage.
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申请公布号 |
US2010275592(A1) |
申请公布日期 |
2010.11.04 |
申请号 |
US20080745784 |
申请日期 |
2008.12.03 |
申请人 |
TOPLISS RICHARD;LEEDHAM ROBERT JOHN;RICHARDS DAVID CHARLES WILLIAM;GREGORY THOMAS MATTHEW |
发明人 |
TOPLISS RICHARD;LEEDHAM ROBERT JOHN;RICHARDS DAVID CHARLES WILLIAM;GREGORY THOMAS MATTHEW |
分类号 |
F03G7/06 |
主分类号 |
F03G7/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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